Experimental Station 5-4

The BL5-4 station is a normal incidence monochromator beam line optimized for high-resolution angle-resolved photoemission spectroscopy (ARPES) in the photon energy range of 7 - 40 eV with polarization control (circular polarizations: 7 - 40 eV, linear polarizations: 16 - 40 eV). The dedicated experimental end station is equipped with a SCIENTA R4000 electron spectrometer. This system is capable of performing ARPES experiments with a total energy resolution of a few meV and an angular resolution of 0.3°. It is also equipped with a low-temperature sample manipulator with two degree of freedom of rotation, which can be cooled down to 5 K. Because BL5-2 and BL5-4 cannot operate simultaneously, they are often shown combined as BL5-4/BL5-2. Users may choose either experimental station for their beamtime. Please confirm with the responsible beam line scientists on the readiness of desired experimental station in advance.

Status
Open
Supported Techniques
Angle-resolved photoelectron spectroscopy
Ultra-high energy resolution photoemission
Main Scientific Disciplines
Condensed Matter Physics
Materials Sciences
Beam Line Specifications

Source

15-period undulator, 31-pole APPLE-II EPU, 0.65 mrad acceptance

  Energy Range Resolution ΔE/E Spot Size Flux (ph/sec)
Focused 7-40 eV ≥ 5 X 10-5 0.1(H) X 0.1(V) mm2 ∼ 8 X 1011

*@500 mA, 22 eV, E/ΔE = 10,000

Optics

  • M0: horizontal deflecting, flat, water-cooled
  • M1: vertical focusing 10:1, elliptically cylinder
  • Monochromator: Normal Incidence Monochromator (NIM)
    • 1700 l/mm: 7 - 18 eV
    • 2800 l/mm: 16 - 40 eV
    • 3600 l/mm: 20 - 40 eV
  • M3: horizontal refocusing 1:1, cylinder
  • M4: vertical refocusing 1:1, cylinder

Absorption

N/A

Instrumentation
  • Detector: SCIENTA R4000 Electron Analyzer
  • Manipulator: Low-temperature 5-axis Manipulator
  • Low Energy Electron Diffraction (LEED)
  • Alkaline metal doser
Sample Environment
  • UHV: < 5 X 10-11 Torr
  • Sample temperature: 5 - 300 K
  • Sample size: < 5 X 5 mm2
  • Annealing temperature: < 650 C°
Data Acquisition and Analysis
Beam Line Phone
650-926-5254. On-site Users: Contact the Duty Operator at 9-926-4040
Beam Line Contact

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